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/* fd-relative mkdir
Copyright (C) 2005, 2006 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
/* written by Jim Meyering */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "openat.h"
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
#include "save-cwd.h"
#include "gettext.h"
#define _(msgid) gettext (msgid)
#include "openat-priv.h"
/* Solaris 10 has no function like this.
Create a subdirectory, FILE, with mode MODE, in the directory
open on descriptor FD. If possible, do it without changing the
working directory. Otherwise, resort to using save_cwd/fchdir,
then mkdir/restore_cwd. If either the save_cwd or the restore_cwd
fails, then give a diagnostic and exit nonzero. */
int
mkdirat (int fd, char const *file, mode_t mode)
{
struct saved_cwd saved_cwd;
int saved_errno;
int err;
if (fd == AT_FDCWD || IS_ABSOLUTE_FILE_NAME (file))
return mkdir (file, mode);
{
char *proc_file;
BUILD_PROC_NAME (proc_file, fd, file);
err = mkdir (proc_file, mode);
/* If the syscall succeeds, or if it fails with an unexpected
errno value, then return right away. Otherwise, fall through
and resort to using save_cwd/restore_cwd. */
if (0 <= err || ! EXPECTED_ERRNO (errno))
return err;
}
if (save_cwd (&saved_cwd) != 0)
openat_save_fail (errno);
if (fchdir (fd) != 0)
{
saved_errno = errno;
free_cwd (&saved_cwd);
errno = saved_errno;
return -1;
}
err = mkdir (file, mode);
saved_errno = (err < 0 ? errno : 0);
if (restore_cwd (&saved_cwd) != 0)
openat_restore_fail (errno);
free_cwd (&saved_cwd);
if (saved_errno)
errno = saved_errno;
return err;
}
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